 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.internal.cheatsheets.composite.views;

 import java.io.IOException ;
 import java.lang.reflect.Constructor ;
 import java.net.URL ;

 import org.eclipse.core.runtime.FileLocator;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.ui.internal.cheatsheets.CheatSheetPlugin;
 import org.eclipse.ui.internal.cheatsheets.ICheatSheetResource;
 import org.eclipse.ui.internal.cheatsheets.Messages;
 import org.eclipse.ui.internal.cheatsheets.registry.CheatSheetRegistryReader;
 import org.eclipse.ui.internal.provisional.cheatsheets.TaskEditor;
 import org.osgi.framework.Bundle;

 public class TaskEditorManager {
     
     private static TaskEditorManager instance;
     
     private TaskEditorManager() {
     }
     
     public static TaskEditorManager getInstance() {
         if (instance == null) {
             instance = new TaskEditorManager();
         }
         return instance;
     }

     public TaskEditor getEditor(String editorKind) {
         CheatSheetRegistryReader.TaskEditorNode editorInfo =
             CheatSheetRegistryReader.getInstance().findTaskEditor(editorKind);
         if (editorInfo != null) {
             TaskEditor editorInstance = null;
             Class extClass = null;
             String className = editorInfo.getClassName();
             try {
                 Bundle bundle = Platform.getBundle(editorInfo.getPluginId());
                 extClass = bundle.loadClass(className);
             } catch (Exception e) {
                 String message = NLS.bind(Messages.ERROR_LOADING_CLASS, (new Object [] {className}));
                 Status status = new Status(IStatus.ERROR, ICheatSheetResource.CHEAT_SHEET_PLUGIN_ID, IStatus.OK, message, e);
                 CheatSheetPlugin.getPlugin().getLog().log(status);
             }
             try {
                 if (extClass != null) {
                     Constructor c = extClass.getConstructor(new Class [0]);
                     Object [] parameters = new Object [0];
                     editorInstance = (TaskEditor) c.newInstance(parameters);
                 }
             } catch (Exception e) {
                 String message = NLS.bind(Messages.ERROR_CREATING_CLASS, (new Object [] {className}));
                 IStatus status = new Status(IStatus.ERROR, ICheatSheetResource.CHEAT_SHEET_PLUGIN_ID, IStatus.OK, message, e);
                 CheatSheetPlugin.getPlugin().getLog().log(status);
             }
             
             return editorInstance;
         }

         return null;
     }

     public ImageDescriptor getImageDescriptor(String editorKind) {
         CheatSheetRegistryReader.TaskEditorNode editorInfo =
             CheatSheetRegistryReader.getInstance().findTaskEditor(editorKind);
         if (editorInfo != null) {
             Bundle bundle = Platform.getBundle(editorInfo.getPluginId());
             URL url = FileLocator.find(bundle, new Path(editorInfo.getIconPath()), null);
             if (url != null) {
                 try {
                     url = FileLocator.resolve(url);
                     return ImageDescriptor.createFromURL(url);
                 } catch (IOException e) {
                     return null;
                 }
             }
         }
         return null;
     }

 }

